bug: Adding Ionic to existing Angular 16 standalone app fails

[joelmeaders]

Adding Ionic to existing Angular standalone app fails

Steps to reproduce:

1. Make a new workspace ng new --create-application=false --new-project-root=apps myworkspace
2. Go into workspace and add a new angular project with any options: ng g application --standalone=true --strict=true
3. Configure ionic in workspace: ionic init --multi-app
4. Add Ionic to app: ng add @ionic/angular --project=myappname

Step 4 fails with:
Could not find file for path: apps/myapp/src/app/app.module.ts

[liamdebeasi]

This should be fixed in Ionic Framework v7.5.6: ionic-team/ionic-framework#28523